/Engine/Source/Runtime/InteractiveToolsFramework/Public/BaseGizmos/CombinedTransformGizmo.h
Broadcast at the beginning of a ClearActiveTarget call, when the ActiveTarget (if present) is not yet disconnected. Gives things a chance to unbind from it.
typedef TMulticastDelegate_TwoParams< void, [UCombinedTransformGizmo](API\Runtime\InteractiveToolsFramework\BaseGizmos\UCombinedTransformGizmo) *, [UTransformProxy](API\Runtime\InteractiveToolsFramework\BaseGizmos\UTransformProxy) * > FOnClearActiveTarget